Search up registered nurses. Use different kinds of sources (books, articles, e-books, encyclopedias, etc). If possible talk to a registered nurse. If not possible, search up interviews with registered nurses. State your thesis. Make an outline, then make a draft. Revise and edit your work and write a finished neat copy.
I believe the answer is A because commas shouldn't come after the world and in answer B and D. Answer C has no commas and therefore cannot be the correct answer.
Answer:
an audio recording of crickets chirping in the backround